Not everything is harmful, just everything anyone might possibly want to do, for fun or profit. And if it's not, someone will decide it is soon. Once you decide to be obsessive about safety/environment/whatever, there is literally no limit to what you will obsess over once (or even before) all the major problems are taken care of. Vehicle emissions and fuel economy are actually the perfect example. All the major improvements - things like catalytic converters and basic EFI which are easily worked around or with by those who really care about performance and don't completely de-character a car even in their worst forms - are now decades old and relatively mature technologies, but the standards never stopped getting tougher, so now engineers are chasing smaller and smaller improvements at greater and greater costs, because they have to rather than because any customer wants them to. Chevrolet now makes a half-ton pickup with a four-cylinder engine, so heavily computerized that there is barely any connection left between what the driver does with the gas pedal and what the engine does in response, all to eke out maybe a 1-2 MPG improvement in government tests - and the engine is so stressed trying to move such a heavy vehicle that it actually returns worse fuel economy than the more traditional six- and eight-cylinder engines in actual use!